Casa Performance have just released a new close ratio gearbox for Lambrettas. The ratios were chosen by Vittorio Tessera to offer a cheaper sporting alternative to the Cyclone 5-speed.
This all new, 4 speed gearbox is designed to fit any Lambretta Series 1, 2, 3 GP / DL or Serveta scooter. It uses a forging for the gear cluster and has been tested on the racetrack.
Unlike the tightly-packed 5-speed conversions which need setting up, this is designed as a simply plug-n-play swap for any conventional 4-speed box.
The gearbox uses an interesting set of tooth combinations which is similar to the old MSC close ratio, apart from 2nd gear:
cluster – loose gear | same ratio as… | % rise |
11-50 | LI 150 1st |
|
14-41 | LI 150 2nd | 55 |
16-39 | LI 125 3rd | 20 |
18-36 | GP 200 4th | 22 |
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The results are:
- A similar 1st to 2nd gap as a standard LI150 gearbox.
- Close, even ratio jumps of around 20% from 2nd to 3rd and from 3rd to 4th
- The same final drive ratio in 4th gear as a GP200 gearbox.
- Top gear will give approx 9.43 mph per 1,000rpm with 18×47 sprockets.
The last point is important because it means that you’ll need to run a big front sprocket (18T or more) with most tuned engine conversions.
The retail price for this in Italy is €375
Available from your nearest Casa Performance dealer
..very similiar AF Rayspeed close ratio £170. Works extremely well under hard driving conditions. Takes abit of getting used to as it has a long first.. on a 5 speed you will be changing gear and getting left behind…ha harrrr